SWI-Prolog -- dde

Documentation
- Reference manual
  - Built-in Predicates
    - Windows DDE interface
      - DDE client interface
        
        open_dde_conversation/3
        
        close_dde_conversation/1
        
        dde_request/3
        
        dde_execute/2
        
        dde_poke/4
- Packages

dde_request(+Handle, +Item, -Value)

Request a value from the server. Item is an atom that identifies the requested data, and Value will be a string (CF_TEXT data in DDE parlance) representing that data, if the request is successful.